Your probably missing some perl modules it needs... go to the installation instructions for the software and make sure the required perl modules are installed... also tail the apache error log and the suexec log while trying to hit those pages.

If those two have been done and still getting errors, I would run a Perl script (although you could run a PHP one as well) and the error msg. -- in the log files or script printout -- should help to determine where the exact error(s) are.